MATLAB: How can i subtract the elements in a coloumn

subtarct

hello

for example, I have : a=[380 0;381 1;382 2;383 3;383 4;383 5;384 6]

I want to go into first column and do this : (381-380), (382-381), (383-382),

how can i do this in a loop or other ways? Thanks for i=1:length(a) b=a(i,1) ????? end

Best Answer

Start reading the tutorials.

diff(a(:,1))

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MATLAB: How to find subsequences

a={'1' '631' '618' '574' '678'}
n=numel(a)
for k=1:n
 b{k}=arrayfun(@(x) k:x,k:n,'un',0)
end
c=[b{:}]'
out=cellfun(@(x) a(x),c,'un',0)
out{1}
out{2}
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MATLAB: Removing rows in big data

In your example, your result saves every 5-th row of the input matrix to the output matrix.

Try this:

M = [(380:400)'  randi(9, size((380:400)'))]               % Create Matrix
Out = M(1:5:end,:)

If you want the result to have every 3-rd row, do this:

Out = M(1:3:end,:)

EDIT — Clarifying the discrepancy.

Best Answer

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MATLAB: How to find subsequences

MATLAB: Removing rows in big data

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